linux-kernel - [PATCH 2/3] scsi: ufs: Keep device power on only fWriteBoosterBufferFlushDuringHibernate == 1

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Date:   Mon, 30 Nov 2020 19:11:42 +0100
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] scsi: ufs: Keep device power on only fWriteBoosterBufferFlushDuringHibernate == 1

From: Bean Huo <beanhuo@...ron.com>

Keep device power mode as active power mode and VCC supply only if
fWriteBoosterBufferFlushDuringHibernate setting 1 is successful.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/scsi/ufs/ufs.h    |  2 ++
 drivers/scsi/ufs/ufshcd.c | 11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index d593edb48767..311d5f7a024d 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -530,6 +530,8 @@ struct ufs_dev_info {
 	bool f_power_on_wp_en;
 	/* Keeps information if any of the LU is power on write protected */
 	bool is_lu_power_on_wp;
+	/* Indicates if flush WB buffer during hibern8 successfully enabled */
+	bool is_hibern8_wb_flush;
 	/* Maximum number of general LU supported by the UFS device */
 	u8 max_lu_supported;
 	u8 wb_dedicated_lu;
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 639ba9d1ccbb..eb7a2534b072 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -285,10 +285,16 @@ static inline void ufshcd_wb_config(struct ufs_hba *hba)
 		dev_err(hba->dev, "%s: Enable WB failed: %d\n", __func__, ret);
 	else
 		dev_info(hba->dev, "%s: Write Booster Configured\n", __func__);
+
 	ret = ufshcd_wb_toggle_flush_during_h8(hba, true);
-	if (ret)
+	if (ret) {
 		dev_err(hba->dev, "%s: En WB flush during H8: failed: %d\n",
 			__func__, ret);
+		hba->dev_info.is_hibern8_wb_flush = false;
+	} else {
+		hba->dev_info.is_hibern8_wb_flush = true;
+	}
+
 	ufshcd_wb_toggle_flush(hba, true);
 }
 
@@ -5440,6 +5446,9 @@ static bool ufshcd_wb_need_flush(struct ufs_hba *hba)
 
 	if (!ufshcd_is_wb_allowed(hba))
 		return false;
+
+	if (!hba->dev_info.is_hibern8_wb_flush)
+		return false;
 	/*
 	 * The ufs device needs the vcc to be ON to flush.
 	 * With user-space reduction enabled, it's enough to enable flush
-- 
2.17.1